Chair-seat mounting



5. M. BUMP CHAIR SEAT MOUNTING Dec. 18, 1928.

Filed Oct. 15,. 1926 abtozmq Patented Dec. 18, 1928.

UNITED STATES (PATENT OFFICE.

srnNcnn in. BUHP, or mxnwoon, omo, AssIGNoR, T rim BETTCHERSTAMPING & MANUFACTURING COMPANY, on cnnvnnann onro, A conrona'rIoN or OHIO.

' CHAIR-SEAT MOUNTING.

Application filed October 15, 1926. Serial No. 141,732.

This invention relates to pedestal chairs of the swiveling ty e, and particularly to chairs of the type w ich may be inclined or rocked backwardly against the tension of a a spring tending normally to hold the chair back and seat in an upright position. The invention relates more particularly to the rocking connection bet-ween the bolts, on which the said spring or springs act to resist the rearward rocking movements of such chair seats, and the abutment-s or cross plates through which said bolts extend and which are usually or pedestal. l i

It is the general purpose and ob ect of the invention to provide, in such nstallations, a rocking connecting unember which is simple in'construction, which can be produced economically and by a stamping operation; and which is stronger than the builtup connecting members which are in generaluse; l a

I accom lish the foregoing objects in and through t e connecting member set forth in detail hereinafter, reference being haduto the drawings, wherein Fig. 1 represents a sectional elevation of parts of achairnseat frame, showin gthe manner in which the said frame is supported from the post or pedestal 39 and the manner in which the aforesaid connecting member is used; Fig. 2 is a plan, with parts broken away, of the frame and arts shown in Fig. 1, showing my connecting member and the parts cooperating therewith; and Fig. 3 is a side elevation, Fig. 4 an end elevation, and Fig. 5 a bottom plan view of the aforesaid connecting member.

Describing by reference characters the various parts shown in the drawings, 1 de- 40 notes the post or pedestal of a chair of the ordinary swivel type, the upper end of the said post or pedestal being shown as reduced in diameter at 2 to form a neck, with supported indirectly by the post a shoulder 3 beneath said neck'on which is.

mounted the bottom plate 4 of a yoke, the said yoke being U-shaped and having the upwardly extending side flanges 5.

6 denotes a pair of angular seat bracket-s which are adapted to support the chair seat in the ordinary manner, the upper flanges 6" of the said brackets being provided with apertures 6 for the reception of bolts or other means for securing the chair seat thereto. Secured to the vertical flanges of the seat brackets, as by rivets 7, are the side the cradle and. being flanges 8 of a cradle or channel-shaped connecting member, the rear web of'which is shown at 9. The lower forward ends of the sides 8 are supported from the sides 5 of the yoke by means of a cross pin 10. A cross bolt 11 which is connected to the vertical denotes a cross plate havinglasubstantially horizontal lower end which has an aperture 12 therein adapted to fit over the-reduced end 2 of the post or. pedestal 1, which reduced end may, beheaded. to form an integral rivet, shown at 2 The cross plate 12 extends upwardly and forwardlyfromthe bottom through which the bolt 13 extends. This bolt has securedv to its rear end a. cross plate 14 which receives therewithin the rear ends of. the springs 15,, the front ends of the portion thereof and is provided with l a, vertical extension having a recess 12 springs bearing against the rear web 9 of lugs 9 web-9.

The front end of the bolt 13 projects through the connecting member, referred to hereinbefore, being provided with a thread on such front end on which is threaded the hub 16 of a hand wheel 16, the hub bearing against the central portion of the said connecting member, which will now be describe The connecting member is made from sheet metal by a stamping operation by which it is provided wit-h a forwardly-projecting arched or dome-shaped central body 17 having an aperture 18 therethrough, the sides of the dome being projecting rearwardly from the said extended and pressed together to form retained in position by preferably and described herein is of decided advantage 1n that said member may be made cheaply,

by a few stamping operations, the central portion of said member surrounding the aperture 18 constituting an arch-support thrust bearing which is very strong and capable of sustaining all thrusts and strains exerted thcreagainst by the sleeve, 16, while the shape and construction of the arms 19 is such as to secure ample strength in these parts to withstand such thrusts and strains.

vHaving thus described my invention, what 1 claim is i a 1. A rocking connecting member for use with one or more springs arranged to resist the backward niovenicnt of swivel chairs and with a bolt having a cross plate engaging such spring or springs and extending forwardly and beyond across member carried by the seat assembly, the said connecting member being formed from a single piece of metal having-a forwardly projecting dome-shaped centralportion provided with an aperture therethrough, the portion of such dome surrounding the said aperture, constituting an arch-supported thrust surface for engagement by an adjustable member on the front of said bolt, said connecting member having integral extensions adapted to bear against said cross member.

2. A rocking connecting member for use with one or more springs arranged to resist the backward movement of swivel chairs and with a bolt having a cross plate engaging such sprin or sprlngs and extending forwardly and beyond a cross member carr ed by the seat assembly, the said connecting member being formed from a single piece oi. metal pressed to a shape to provide a central forwardly-projecting dome-sha )GCl portion having an aperture thercthrough for the reception of the said red, the portion oi? such dome surrounding the aperture instituting 'an arch supported thrust surface for engagement by an adjustable member on the front of said bolt, the said connecting member comprising also double-walled lateral extensions constituting arms provided at their ends with bearings adapted to engage said cross member.

A rocking connecting member for use with one or more springs arranged to resist the backward movement of swivel chairs and with a bolt having a cross plate engaging suchspring or springs and extending forwardly and beyond a cross member carried by the seat assembly, the said connecting member being formed from a single piece of metal having a central dome-shaped portion provided with side flanges, the dome- SlHIPECl'POlblOD having an oneningtherethrough for the passage of said rod and provided with an arch-supported thrust surface surrounding said aperture and adapted to take the thrust of the rod through the engagement therewith of a member adjustably mounted on the front thereof, the side flanges bein extended from such dome on both sidestiereof and pressed together to form legs, each leg terminating in a bearing adapted to engage said cross member.

In testimony whereof, I hereunto aflix my SPENCER M. BUMP.

signature. 

